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pressure measurement

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Brake shoe pressure software
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PT500-304

Model: PT500-304
Keywords imported pressure sensitive chip; selected chip mounting technology;
Imported crystal element, high performance, all solid state, high reliability;
Constant current source 1.5mA power supply, differential bridge output;
More than 1 million service life;
High impedance, high precision, small measuring range, high stability;

Common keywords:
Diffused silicon pressure core oil filled pressure core diffused silicon pressure chip
Micro pressure core negative pressure core absolute pressure chip

Product parameters
Specification parameter
Ordering considerations
Precautions for use
Common problem
Proposal

Chip:

Keywords imported pressure sensitive chip; selected chip mounting technology;

Imported crystal element, high performance, all solid state, high reliability;

Constant current source 1.5mA power supply, differential bridge output;

High impedance, high precision, small measuring range, high stability;

elastomer:

Wide range (- 100KPA ~ 50kPa ~ 100MPa / - 100KPA ~ 0 vacuum)

The pressure sensitive film adopts imported elastic material, precision machining integrated structure, strict machining, heat treatment and aging treatment process;

The highest range is 100MPa, and the safety failure pressure is over 150MPa;

More than 1 million service life;

Structure:

Thick film structure: deep laser welding, connecting elastic material and shell, high strength, impact resistance, fatigue resistance;

Thin film structure, silicone oil medium transfer pressure, fast response, fatigue resistance, small range;

The overall structure is small, with various process connection methods (diameter 19mm, 13mm, DN50, DN100, etc.);

Process connection material: 316;

Four core color wire or enameled wire;

Signal processing:

Constant current source 1.5mA power supply, differential bridge output;

With temperature compensation;

Application:

Pressure sensing core of general pressure transmitter;

Pressure sensing core of liquid level and water level transmitter;

Pressure measurement in other civil / industrial automation fields;

Application fields:

Product family:

1、 Technical parameters
19 series range
Gauge pressure g (kPa): 10, 20, 35, 70, 100, 160, 250, 400, 600
Gauge pressure g (MPA): - 0.1 ～ 0.1, - 0.1 ～ 0, - 0.1 ～ 0.25, - 0.1 ～ 0.6, - 0.1 ～ 1, - 0.1 ～ 1.6, - 0.1 ～ 2.5
Gauge pressure g (MPA): 1, 1.6, 2.5, 4, 6, 10, 16, 25, 40, 60, 100
Absolute pressure a (kPa): 35, 100, 250, 600, 1000, 1600, 2500
Differential pressure d (kPa): 35, 100, 500, 1000, 5000, 10000
13 series range
Gauge pressure g (kPa): 35, 75, 100, 160, 250, 400, 600
Gauge pressure g (MPA): - 0.1-0.1, - 0.1-0, - 0.1-0.25
Gauge pressure g (MPA): 1, 1.6, 2.5, 4, 6, 10, 16, 25, 40, 60
Absolute pressure a (kPa): 100, 250, 1000

? ? ? ? ? ??

Measuring medium: liquid and gas (compatible with connecting materials of product process)
Pressure form: gauge pressure, absolute pressure and differential pressure
Output signal: 70-100mv
Power supply: 1.5mA constant current power supply
Comprehensive accuracy: ± 0.25% FS; ± 0.5% FS; ± 1% FS
Non linear: ≤ 0.25% FS
Repeatability: ≤ 0.1% FS
Zero point output: ± 2mV
Zero temperature drift: 0.02% FS / ℃
Sensitivity temperature drift: 0.02% FS / ℃
Vibration: 20g / (20-5000hz)
Insulation impedance: ≥ 1000m Ω / 100VDC
Output impedance: 3K Ω ～ 6K Ω
Medium temperature: - 20-80 ℃
Ambient temperature: - 20 ～ 70 ℃
Compensation temperature: 0 ～ 70 ℃
Response time: ≤ 5ms
Overload pressure: 150% FS
Failure pressure: 3 times of range (range less than 200MPa); 2 times of range (range greater than 201mpa)
Electrical connections: direct leads
Seal ring: φ 16 × 1.7mm (NBR or fluorinated rubber)
Oil filled material: silicone oil, olive oil (sanitary type)
Protection grade: IP65
Connecting cable: four core silicone wire, standard length: 50mm
Connecting material: imported elastomer material
Process connection: 19 / 13 / 50.8/dn50/dn80/dn100

2、 Specification and model

3、 Structural dimensions

4、 Electrical connection

1. Product range selection:

In order to achieve the best effect of product accuracy, life, stability and other functions, the range selection of the product is calculated by referring to the following formula:

Range = x (1.2-1.5) times of the maximum system pressure;

The actual measuring pressure range of the product should be 15% - 80% of the range;

2. Product power supply and output:

The power supply of the pressure core is 1.5mA from the constant current source;

The core output is differential bridge output;

Bridge impedance: 3-5k ohm

The output signal is about 70-100mv

3. The user should understand the measurement medium characteristics of the product:

Medium specification, medium temperature, medium purity (whether containing impurities or particles, etc.);

4. Users should understand the installation environment and installation mode of the product:

Indoor or outdoor installation;

Ambient temperature;

Required sealing level;

Vibration range of equipment;

Installation method: thread, flange, special structure;

Whether the installation space meets the overall dimension of the product;

The power supply of the product is constant current power supply, 1.5mA;

It is strictly prohibited to use hard objects (such as screwdriver, finger, iron nail, etc.) to make the pressure core subject to pressure measurement output;

The power and signal wires shall be correctly wired according to the specifications of the ordered products;

During installation, a small amount of vacuum grease shall be evenly applied on the surface of "O" ring;

Push the core into the cavity evenly along the axial direction of the cavity, and pay attention that the "O" ring cannot be damaged;

Pay attention to the protection of the lead of the pressure core, and the lead shall not be pulled;

The pressure core is a precision measuring instrument. Do not force impact or smash to avoid damaging the core

It is strictly prohibited that the medium temperature, pressure range and excitation voltage of the tested system exceed the rated use range of the core;

The "O" ring seal is a suspension seal, which is an absolutely reliable static seal. No other seal is needed. It can be used in 40MPa pressure environment under normal conditions;

When the pressure exceeds 25MPa, it needs to be equipped with a retaining ring for combined use, and the sealing pressure can reach 400MPa;

When assembling a small range core, it is not easy to press hard, so the extra force will make the core temperature special;

Question 1: no output of pressure core?

Cause handling method

Lead open circuit check lead and repair

Broken bridge cannot be repaired, replace

Strip the wire again for poor contact

Question 2: is the pressure core output correct?

Cause handling method

The bridge and road wiring is not correct according to the product instructions

Check and remove the external force on the chip sealing area

Core or chip damaged, unable to repair, replace

Question 3: unstable pressure core output information?

Cause handling method

Lead wire poor contact check lead wire and repair

Check and remove the external force on the chip sealing area

Check and repair the unstable power supply of constant current source

Constant current source input impedance mismatch replacement

Constant current source power is not enough to replace

Elastomer overpressure or large impact replacement

Inspect and repair the poor insulation

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